Abstract
One of the main techniques for the Finite-Difierence Time-Domain (FDTD) analysis of dispersive media is the Recursive Convolution (RC) method. The idea here proposed for calculating the updating FDTD equation is based on the Laplace transform and is applied to the Drude dispersion case. A novel RC-FDTD algorithm, that we call modifled, is then deduced. We test our algorithm by simulating gold and silver nanospheres exposed to an optical plane wave and by comparing the results with the analytical solution. The modifled algorithm guarantees a better overall accuracy of the solution, in particular at the plasmonic resonance frequencies.
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